"This will bring in billions of dollars of trade" - No it won't! Tell me whom is going to be trading what to whom. What do they have that is so important that we will pay them billions of dollars for??? Isn't their currency worth about one twentieth of ours??? Tell me, really, isn't this simply about us buying their goods and not about them buying ours???
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I think a brush up of the fundmentals of economics would aid in helping you formulate your opinions. Until then, check this out:
http://www.heritage.org/Research/TradeandForeignAid/bg1761.cfm
The heritage foundation is a twin organization to the Council on Foreign Relations. They both have exactly the same idea on hemispheric integration coerced into being by "free trade", which is, they are for it.